Improvement in key-fasteners



UNITED STA ES PATENT OEEIo JAMES KNIGHT, OF DENVER, COLORADO TERRITORY.

IMPROVEMENT IN KEY-FASTENERS.

Specification forming part of Letters Patent No. 167,674, datedSeptember 14, 1875; application filed.

July 9, 1875.

To all whom it may concern Be it known that 1, JAMES KNIGHT, of Denver,in the county of Arapahoe and Territory of Colorado, have invented a newand Improved Key-Fastener and I do hereby declare the following to be afull and exact description of the same, reference being had to theaccompanying drawings forming a part of this specification, in whichFigure 1 is a perspective view of my keyfastener applied to a key thatis in the lock of a door. Fig. 2 is a perspective view of thekey-fastener, detached from the door. Fig. 3 is a view showing the claspunfastened and top turned back on its hinges. Fig. 4 shows thekey-fastener with the top closed and the slotted arm pressed up againstthe top in the most compact manner.

Similar letters of reference in the accompanying drawings denote thesame parts.

This invention relates to key-fasteners, by

the use of which the key in a door is prevented from being turned by anymeans from the opposite side, in which it is, and has for its object toprovide for the public an inexpensive and efficient means of securingtheir doors against being opened by professional burglars orsneak-thieves.

To these ends the invention consists in the peculiar construction of thedevice, as hereinafter more fully described and definitely claimed.

In the drawings, A represents the key-fastener in position, to preventthe key from being turned. B is the key through which the slotted arm 0passes. D is the shank of the knob, around which the hinged top E closesand holds itself in position. F is a bent arm,

hinged at a, with top E. G is a bent arm, at the upper end of which isthe catch b, for holding clasp c in position. The slotted arm 0 slidesbetween the bent arms F and G, which are held in proper position by tworivets passing through the slot in the arm 0.

To apply this device to the purpose for which it is intended, take it inits most compact form, as shown in Fig. 4., draw the slotted arm down asfar as possible, unclaspthe top from the catch 1), and turn back on thehinge until the top is open, as shown in Fig. 3; then put the slottedarm 0 through the key B, clasp the top around the shank D, and make fastwith catch 12 and clasp a altogether, as shown in Fig. 1.

It will now be seen that the key cannot be turned in the look withoutdetaching the keyfastener, which cannot be done by any means orappliances from the opposite side of the door. 1

The whole arrangement is simple, inexpens-v ive, and efl'ective.

I'claim as my invention and desire to secure 1 by Letters Patent 1. In akey-fastener, the slotted arm 0,

